Excitation cabinet with network control function

Abstract

The utility model discloses an excitation cabinet with a network control function, which comprises a cabinet door and a cabinet body, an operation screen and an electric quantity detection meter are arranged on the cabinet door, and an alternating current voltage regulating device and a network master control programmable logic controller (PLC) are arranged in the cabinet body. According to the utility model, the AC voltage regulation excitation control system and the operation screen of the Ethernet are adopted, the motor is controlled in the optimal working condition, the operation response speed of the excitation cabinet is greatly accelerated, the network diagnosis function is greatly improved, and the remote debugging and operation and maintenance functions are optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of excitation cabinet, in particular to a kind of excitation cabinet with network control function. BACKGROUND

[0002] Excitation cabinet is currently based on original thyristor technology, and is only used to provide excitation. For more and more frequency converters used in conjunction with soft start high voltage switch control and motor protection functions, it is basically not involved, and the external excitation interface is also hard-wired analog configuration, which has the weaknesses of slow response speed, easy to be disturbed, low speed of system network interconnection and openness, and cannot meet the requirements of increasing intelligence and digitization. SUMMARY

[0003] The purpose of the present application is to solve the above technical problems, to provide a new excitation cabinet with network control device installed in the excitation cabinet, which greatly improves the operation efficiency and diagnostic function of the excitation cabinet, and greatly simplifies the remote debugging and operation and maintenance functions.

[0004] The present application provides the following technical solutions:

[0005] An excitation cabinet with network control function, comprising a cabinet body and a cabinet door, the cabinet body can be a whole cabinet or a split cabinet, the cabinet door is provided with an operation screen and an electric quantity detector, the cabinet body is provided with an AC voltage regulator and a programmable controller, characterized in that: a network master PLC, a switch and a gateway are installed in the cabinet body.

[0006] As a preferred embodiment of the present application, the excitation cabinet with network control function is provided with a network port, and the network port is connected to the switch, the gateway, the AC voltage regulator, the operation screen and the electric quantity detector through a network cable to control the operation of the excitation cabinet.

[0007] 3. As a preferred embodiment of the present application, the excitation cabinet with network control function is provided with a network interface on the operation screen, and the network interface is connected to the switch and the network master PLC through a network cable to monitor and control the operation of the excitation cabinet.

[0008] 4. As a preferred embodiment of the present application, the excitation cabinet with network control function is provided with a network interface on the electric quantity detector, and the network interface is connected to the switch and the network master PLC through a network cable to detect the electric quantity signal of the motor.

[0009] 5. As a preferred embodiment of the present application, the excitation cabinet with network control function is provided with a network interface on the AC voltage regulator, and the network interface is connected to the switch and the network master PLC through a network cable to provide the rotor current required for the operation of the synchronous motor.

[0010] The excitation cabinet connects important components, including AC voltage regulating device, electric quantity detector, operation screen, programmable controller and gateway of the excitation cabinet, through industrial Ethernet PROFINET interface technology, so that the response speed of the excitation cabinet is greatly improved, the network diagnosis function is greatly improved, and the remote debugging and operation and maintenance functions are simplified. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a whole plane schematic view of the utility model

[0012] Figure 2 It is a network structure schematic view of the utility model

[0013] In the figure: 1, AC voltage regulating device 2, network master PLC (programmable controller) 4, switch 5, operation screen 7, electric quantity detector 9, excitation cabinet door 10, excitation cabinet body 11, gateway DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings. Obviously, the embodiments are not all. Other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. EMBODIMENT

[0015] Please refer to Figure 1 、 Figure 2 The embodiment provides the following technical solutions:

[0016] An excitation cabinet with network control function, comprising an excitation cabinet door 9 and a cabinet body 10, wherein the cabinet door 9 is provided with an operation screen 5 and an electric quantity detector 7, and the cabinet body 10 is provided with a network master PLC (programmable controller) 2, which is connected with a switch 4, AC voltage regulating device 1, operation screen 5, electric quantity detector 7 and gateway 11 through industrial Ethernet PROFINET interface technology.

[0017] In the embodiment, the network master PLC (programmable controller) 2 of the excitation cabinet controls the system to be connected and communicated with external high-voltage frequency converters and host computer systems through a gateway, so that the universality and practicability of the excitation control system are greatly improved. In the embodiment, the network master PLC (programmable controller) 2 controls the system to be connected and communicated with external high-voltage frequency converters and host computer systems through a gateway. In the embodiment, the ANYBUS gateway 11 is connected with the switch 4, the interface of the switch 4 is connected with the network interface of the AC voltage regulating device 1, electric quantity detector 7, operation screen 5 and network master PLC (programmable controller) 2 through a network cable, so that the excitation cabinet can be controlled, communicated and debugged through the network.

[0018] The operation screen 5 is provided with an industrial Ethernet interface connected with the switch 4 of the motor excitation cabinet. The operation screen 5 uses a TP900 operation panel to realize the monitoring of the main motor control screen picture (excitation control operation) of different control modes and the change of the setting value, and the man-machine interface of the excitation cabinet is written by the Baidu software. Through the interface, the ideal power factor of the motor and the starting auxiliary excitation current can be set. By adjusting the size of the two parameters, the corresponding change of the motor current when the load is different is met, so that the motor output power meets the requirements. The protection setting and monitoring data of the motor and excitation, such as motor temperature, current, voltage, power and other data, are also displayed on the operation screen.

[0019] The power detection meter 7 communicates with the network master controller PLC (programmable controller) 2 of the excitation cabinet through the network interface. All motor power signals enter the meter through PT and CT, the reactive power and power factor data of the reactive power and power factor control in the closed-loop control mode of the excitation cabinet are calculated and transmitted to the programmable controller through the network interface, and the important closed-loop control function of the excitation control system is completed.

[0020] The AC voltage regulating device 1 is arranged in the excitation cabinet body 10, an industrial Ethernet interface is arranged, and the rotor current required for the motor operation is provided. At the same time, the control adopts a fixed excitation, fixed reactive power and fixed power factor control mode, and the size of the excitation current required for the motor operation is automatically adjusted. The control data is connected with the programmable controller through the Ethernet, which can meet the requirements of compact structure, high communication rate, reliable operation and space saving. The intelligent full-digital compact design enables the service and maintenance to be carried out through the remote network, and each individual part can be conveniently monitored and replaced.

[0021] The network master controller PLC (programmable controller) 2 in the excitation cabinet is used as the CPU master control unit, which controls the overall network operation of the excitation cabinet, greatly improves the system response speed, greatly improves the network diagnosis function, and simplifies the remote debugging and operation and maintenance function.

[0022] In this embodiment, the excitation cabinet communicates with the excitation cabinet equipment at high speed and in real time through the PROFINET industrial Ethernet. Real-time communication and isochronous synchronous real-time communication are supported, real-time signal processing is ensured, and the excitation cabinet is suitable for various industrial equipment and control systems. Through the PROFINET industrial Ethernet, the user can integrate the alternating current voltage regulating device 1, the operation screen 5, the electric quantity detection meter 7, and the network master controller PLC (programmable controller) 2 into the existing PROFINET network. The PROFINET protocol is an industrial Ethernet protocol based on EtherNet / IP, which is an open industrial network protocol suitable for complex industrial automation systems. Through the PROFINET, the user can realize seamless integration with other devices supporting the protocol. This design not only improves the overall performance of the system, but also provides convenience for the user's system construction and maintenance.

[0023] The above only describes preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement is carried out to part technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0024] The excitation system can realize closed-loop regulation and control, can strengthen the dynamic stability of the motor and the power supply network, and simultaneously optimizes the reactive power distribution. The excitation cabinet is designed for synchronous motors and is started by a high-voltage frequency converter.

[0025] When the control system issues a "start" command to the excitation control cabinet, the motor excitation cabinet control main switch is closed, the motor is started, the excitation is first excited, the frequency converter finds the motor rotor position, and then the output frequency is increased by controlling the current and speed of the synchronous motor to start the motor.

[0026] During the starting process, the excitation cabinet receives the excitation setting from the frequency converter and outputs it to the motor. When the motor speed reaches 98% of the rated speed, the frequency converter issues a command to adjust the motor speed and motor voltage. When the synchronization state is entered, that is, the motor voltage, frequency and phase angle meet the conditions at the same time, the frequency converter sends a closing command to the "MBL" switch through the interface cabinet, which is called "upper cut" function. At the same time, the frequency converter receives the command and blocks the motor side trigger pulse, then opens the "MBC" and "MBM". When the motor is connected to the grid, the excitation current setting is immediately switched to the TP900 setting and runs in the selected mode:

[0027] 1. Constant current excitation, 2. Constant power factor excitation, 3. Constant reactive excitation, three control modes.

[0028] The motor excitation system has a strong excitation function. The excitation should quickly respond to the given frequency converter to ensure that the synchronous machine is quickly pulled into synchronous operation. Users can set the strong excitation multiple and strong excitation time in the software according to the working condition. When out of step, the strong excitation can pull the synchronization, and the number of times of pulling the synchronization can be set in the software.

Claims

1. A kind of excitation cabinet with network control function, including cabinet (10) and cabinet door (9), cabinet (10) is a whole cabinet, cabinet door (9) is set operation screen (5), electric quantity detection meter (7), AC voltage regulating device (1) is set in cabinet (10), network main controller PLC (2), it is characterized by: The cabinet (10) is internally provided with a network master PLC (2), a switch (4) and a gateway (11).

2. The field control cabinet having a network control function according to claim 1, characterized by: The network master PLC (2) is provided with a network port and is connected with the switch (4), the gateway (11), the AC voltage regulating device (1), the operation screen (5) and the electric quantity detector (7) through network lines to control the operation of the excitation cabinet.

3. The field control cabinet having a network control function according to claim 1 or 2, characterized in that: The operation screen (5) is provided with a network interface and is connected with the switch (4) and the network master PLC (2) through network lines to monitor and control the operation of the excitation cabinet.

4. The field control cabinet having a network control function according to claim 1 or 2, characterized by: The electric quantity detector (7) is provided with a network interface and is connected with the switch (4) and the network master PLC (2) through network lines to detect the electric quantity signal of the motor.

5. The field control cabinet having a network control function according to claim 1 or 2, characterized by: The AC voltage regulating device (1) is provided with a network interface and is connected with the switch (4) and the network master PLC (2) through network lines to provide the motor with the rotor current required for operation.

Images